Something is filling my drive C

Even with ZoneAlarm Antivirus updated last week somehow I must have got a virus or worm. After an update from Microsoft and restart, I got an error message for winlogon.exe telling that an intruction at &quot;0x7c883f9c&quot; cannot be written. After checking the HD I saw that drive C, with 38 gb of space, was completely full. I erased temp files and got 12 mb of free space but after less than 1 minute drive C was full again. I moved to drive D my outlook folder, Internet Temp files folder and virtual memory. This gave much more free space on drive C, but after a short time, drive C was full again. I cannot more update ZonaAlarm antivirus because it tells me that drive C is full. Any idea what it may be?

Re: Something is filling my drive C

Re: Something is filling my drive C

Thanks for your reply, but what I want to do, is to be sure that my computer is not infected with something. I for sure can reinstall my windows, but if I have any of my documents infected and open them, my computer can be infected again.

Today I checked folder by folder and found one that uses 31.1 gb of my 38 gb partition C, it is a folder named c:\windows\PCHealth. Now must check
if this belongs to windows XP or
if it is a worm. ZoneAlarm antivirus not found anything.